[DO NOT MERGE] Ignore Postsubmit tests in SystemUIGoogleScreenshotTests

Bug: 271331584
Test: atest AODClockOPRTest
Change-Id: Ife6d0816c8eaf0f5d39deb637fd02c9fcff6dff8
Merged-In: Ife6d0816c8eaf0f5d39deb637fd02c9fcff6dff8
1 file changed